“By 1920, Ferriss had begun to develop his own style, frequently presenting the building at night, lit up by spotlights, or in a fog, as if photographed with a soft focus. The shadows cast by and on the building became almost as important as the revealed surfaces. He had somehow managed to develop a style that would elicit emotional responses from the viewer.”

“In 1916, New York City had passed landmark zoning laws that regulated and limited the mass of buildings according to a formula. The reason was to counteract the tendency for buildings to occupy the whole of their lot and go straight up as far as was possible. Since many architects were not sure exactly what these laws meant for their designs, in 1922 the skyscraper architect Harvey Wiley Corbett commissioned Ferriss to draw a series of four step-by-step perspectives demonstrating the architectural consequences of the zoning law.”—Wikipedia